Mphasis Placement Paper -: .Net Questions With Answers

Mphasis Previous Years Solved Sample Placement Papers

1. To declare an array, define the variable type with ___.

   A: Square brackets []

   B: Curly brackets {}

   C: Round brackets ()

   D: None of the above

   Ans: A

   Explanation:

   To declare an array, define the variable type with square brackets [].

2. What will be the output of the following C# code?

   using System;
   
   namespace MyApplication {
     class Program {
       static void Main(string[] args) {
         string[] mobiles = { "iPhone", "Samsung", "Vivo"};
         Console.WriteLine(mobiles);
       }
     }
   }
       

   A: "iPhone", "Samsung", "Vivo"

   B: {"iPhone", "Samsung", "Vivo"}

   C: string[]

   D: System.String[]

   Ans: D

   Explanation:

   In the above code, the statement Console.WriteLine(mobiles); will print the type of the variable that is System.String[].

3. What will be the output of the following C# code?

   using System;
   
   namespace MyApplication {
     class Program {
       static void Main(string[] args) {
         string[] mobiles = {"iPhone", "Samsung", "Vivo"};
         Console.WriteLine(mobiles[-1]);
       }
     }
   }
       

   A: None

   B: Warning

   C: Exception

   D: System.String[]

   Ans: C

   Explanation:

   The array index starts from 0 in C#. In the above code, we are trying to access an element with index -1, resulting in an exception: System.IndexOutOfRangeException.

4. Which statement is correct about the following C# statement?

   int[] x = {10, 20, 30};

   A: 'x' is a reference to the array created on stack

   B: 'x' is a reference to an object created on stack

   C: 'x' is a reference to an object of a 'System.Array' class

   D: None of the above

   Ans: C

   Explanation:

   In the above given C# statement, the variable x is a reference to an object of a System.Array class.

5. Which array property is used to get the total number of elements in C#?

   A: Len

   B: Length

   C: Elements

   D: MaxLen

   Ans: B

   Explanation:

   The Length property is used to get the total number of elements in C#.

6. What will be the output of the following C# code?

   using System;
   
   namespace MyApplication {
     class Program {
       static void Main(string[] args) {
         string[] mobiles = {"iPhone", "Samsung", "Vivo"};
         Console.WriteLine(mobiles[0] + mobiles[2]);
       }
     }
   }
       

   A: iPhoneVivo

   B: iPhone+Vivo

   C: Exception

   D: iPhone Vivo

   Ans: A

   Explanation:

   The statement mobiles[0] + mobiles[2] concatenates the 0th and 2nd elements, resulting in "iPhoneVivo".

7. Which array method is used to sort an array alphabetically or in ascending order in C#?

   A: sort()

   B: sorting()

   C: Sort()

   D: Sorting()

   Ans: C

   Explanation:

   The Sort() method is used to sort an array alphabetically or in ascending order in C#.

8. What will be the output of the following C# code?

   using System;
   
   namespace MyApplication {
     class Program {
       static void Main(string[] args) {
         int[,] ARR = {{1,2},{3,4}};
         Console.WriteLine(ARR.GetLength(0) + "," + ARR.GetLength(1));
       }
     }
   }
       

   A: 4,4

   B: 2,2

   C: Compilation Error

   D: Runtime Error

   Ans: B

   Explanation:

   The code prints the dimensions of the 2D array. The first dimension (rows) and the second dimension (columns) both have lengths of 2, so the output is 2,2.

9. Which is the correct syntax to declare an array with 2 rows and 3 columns in C#?

   A: int arr[2][3] = new int[2][3];

   B: int arr[2,3] = new int[2,3];

   C: int[,] arr = new int[2,3];

   D: int [,]arr = new [2,3]int;

   Ans: C

   Explanation:

   The correct way to declare an array with 2 rows and 3 columns in C# is:

   int[,] arr = new int[2,3];